root/tools/perf/tests/topology.c

DEFINITIONS

1. get_temp
2. session_write_header
3. check_cpu_topology
4. test__session_topology

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <string.h>
   3 #include <stdlib.h>
   4 #include <stdio.h>
   5 #include <perf/cpumap.h>
   6 #include "cpumap.h"
   7 #include "tests.h"
   8 #include "session.h"
   9 #include "evlist.h"
  10 #include "debug.h"
  11 #include <linux/err.h>
  12 
  13 #define TEMPL "/tmp/perf-test-XXXXXX"
  14 #define DATA_SIZE       10
  15 
  16 static int get_temp(char *path)
  17 {
  18         int fd;
  19 
  20         strcpy(path, TEMPL);
  21 
  22         fd = mkstemp(path);
  23         if (fd < 0) {
  24                 perror("mkstemp failed");
  25                 return -1;
  26         }
  27 
  28         close(fd);
  29         return 0;
  30 }
  31 
  32 static int session_write_header(char *path)
  33 {
  34         struct perf_session *session;
  35         struct perf_data data = {
  36                 .file      = {
  37                         .path = path,
  38                 },
  39                 .mode      = PERF_DATA_MODE_WRITE,
  40         };
  41 
  42         session = perf_session__new(&data, false, NULL);
  43         TEST_ASSERT_VAL("can't get session", !IS_ERR(session));
  44 
  45         session->evlist = perf_evlist__new_default();
  46         TEST_ASSERT_VAL("can't get evlist", session->evlist);
  47 
  48         perf_header__set_feat(&session->header, HEADER_CPU_TOPOLOGY);
  49         perf_header__set_feat(&session->header, HEADER_NRCPUS);
  50         perf_header__set_feat(&session->header, HEADER_ARCH);
  51 
  52         session->header.data_size += DATA_SIZE;
  53 
  54         TEST_ASSERT_VAL("failed to write header",
  55                         !perf_session__write_header(session, session->evlist, data.file.fd, true));
  56 
  57         perf_session__delete(session);
  58 
  59         return 0;
  60 }
  61 
  62 static int check_cpu_topology(char *path, struct perf_cpu_map *map)
  63 {
  64         struct perf_session *session;
  65         struct perf_data data = {
  66                 .file      = {
  67                         .path = path,
  68                 },
  69                 .mode      = PERF_DATA_MODE_READ,
  70         };
  71         int i;
  72 
  73         session = perf_session__new(&data, false, NULL);
  74         TEST_ASSERT_VAL("can't get session", !IS_ERR(session));
  75 
  76         /* On platforms with large numbers of CPUs process_cpu_topology()
  77          * might issue an error while reading the perf.data file section
  78          * HEADER_CPU_TOPOLOGY and the cpu_topology_map pointed to by member
  79          * cpu is a NULL pointer.
  80          * Example: On s390
  81          *   CPU 0 is on core_id 0 and physical_package_id 6
  82          *   CPU 1 is on core_id 1 and physical_package_id 3
  83          *
  84          *   Core_id and physical_package_id are platform and architecture
  85          *   dependend and might have higher numbers than the CPU id.
  86          *   This actually depends on the configuration.
  87          *
  88          *  In this case process_cpu_topology() prints error message:
  89          *  "socket_id number is too big. You may need to upgrade the
  90          *  perf tool."
  91          *
  92          *  This is the reason why this test might be skipped.
  93          */
  94         if (!session->header.env.cpu)
  95                 return TEST_SKIP;
  96 
  97         for (i = 0; i < session->header.env.nr_cpus_avail; i++) {
  98                 if (!cpu_map__has(map, i))
  99                         continue;
 100                 pr_debug("CPU %d, core %d, socket %d\n", i,
 101                          session->header.env.cpu[i].core_id,
 102                          session->header.env.cpu[i].socket_id);
 103         }
 104 
 105         for (i = 0; i < map->nr; i++) {
 106                 TEST_ASSERT_VAL("Core ID doesn't match",
 107                         (session->header.env.cpu[map->map[i]].core_id == (cpu_map__get_core(map, i, NULL) & 0xffff)));
 108 
 109                 TEST_ASSERT_VAL("Socket ID doesn't match",
 110                         (session->header.env.cpu[map->map[i]].socket_id == cpu_map__get_socket(map, i, NULL)));
 111         }
 112 
 113         perf_session__delete(session);
 114 
 115         return 0;
 116 }
 117 
 118 int test__session_topology(struct test *test __maybe_unused, int subtest __maybe_unused)
 119 {
 120         char path[PATH_MAX];
 121         struct perf_cpu_map *map;
 122         int ret = TEST_FAIL;
 123 
 124         TEST_ASSERT_VAL("can't get templ file", !get_temp(path));
 125 
 126         pr_debug("templ file: %s\n", path);
 127 
 128         if (session_write_header(path))
 129                 goto free_path;
 130 
 131         map = perf_cpu_map__new(NULL);
 132         if (map == NULL) {
 133                 pr_debug("failed to get system cpumap\n");
 134                 goto free_path;
 135         }
 136 
 137         ret = check_cpu_topology(path, map);
 138         perf_cpu_map__put(map);
 139 
 140 free_path:
 141         unlink(path);
 142         return ret;
 143 }